Puppet-valve



H. W. EVANS.

PUPPET VALVE.

APPLICATION FILED MAY I9, 1919.

1,358,429 Patent-ed Nov. 9, 1920.

mvawtoz UNITED STATES PATENT OFFICE.

HAROLD W. EVANS, OF WASHINGTON, DISTRICT OF COLUMBIA.

rower-VA VE.

Specification of LettersPatent. Patented N A), 1920,

. Application filed May 19, 1919. Serial No. 298,301.

(FILED UNDER THE ACT OF MARCH 3, 1883, 22 STAT. In, 625.)

To all whom it may concern:

Be it known that 1, HAROLD 1V. Evans, a citizen of the United States,stationed at livashington, D. C., have invented an 1m provement inPuppet-Valves, of which the following is a specification.

The invention described herein may be used by the Government, or any ofits officers or employees in prosecution of work for the Government, orby any other person in the United. States, without payment of anyroyalty thereon.

This invention relates 'to puppet-valves for internal combustionengines, and one of its objects is to design a valve having a s spindleor stem operable directly from the cam-shaft so as to dispense with pushrods and other intermediate parts incidental to assemblies of this type.

Another object of this invention is to provide a puppet-valve having.means for modifying the length of its stem to enable rapid andconvenient adjustment.

Another object is to provide a valve assemblyhaving means fornormallylocking its adjustable parts to prevent disarrangement subsequent toadjustment. 1

With these and other objects in view my invention conslsts in certainnovel detalls of constructlon, combination and arrange- 1 ment of partsto be more particularly set forth and claimed. Referring more particu-.

larly to the accompanying drawing in which corresponding partsareindicated by similar reference characters:

Figure l'is a transverse vertical sectio partly in elevation, takenalong the axis the valve; Fig. 2 is a horizontal section on the line 2-2of Fig. 1; I

Fig. 3 is a similar view on the line 3 -3 of Fig. 1.

Briefly stated, this invention comprises a valve having a hollow stem, avalvestem guide, inner and outer compression springs, a tappet providedwith an externally threaded spindle telescopically engaging a valvestem, a spring retainer andadjusting collar having an outwardly inclinedflange adapted to seat in a similarly shaped retaining flange formed onthe tappet and means affording an interlocking engagement between thespring retainer and adjusting eollar and valve spindle.

In the illustrated embodiment characterizing this invention there isshown a frag ment of a standard internal combustion motor sharing avalve seat Z), seating a valve 1, the spindle 2 of which projectsthrough a guide 3. The guide 3 is separate from the head casting andremovable there from; midway its lengtli it is provided with a shoulder3. j

The spindle 2 is hollowed throughout the greater portion of its lengthas at 4:, the hollow portion being provided with tapped threads 5 toengage threads 6 formed on spindle 7 of the tappet 8, when the former istelescopically positioned in valve spindle 2. Tappet 8 is formed with aflange 9,

the inner surface of which is downwardly Spindle bears at its lower endagainst the shoulder 3 on the valve stem guide and at its upper endbears against the collar 12.

The outer compression spring '14, as explained, bears against a part ofthe valve seat and forces the collar into engagementwith the tappet,while the innercompression spring 13, bearing at its upper end againstthe collar, serves lit/part the same p rpose, but in addition thereto,by its pressure on the shoulder on the removable valve stem guide itserves a secondary purpose of maintaining the valve stem guide inposition. Tool openings 15 and 16 in tappet and adjusting collar permittheir actuation when a clearance adjustment is being made. 001- lar 12is fixedly secured to valve stem 2 adj acent its lower end by means oftongues 17 fitted into slots 18 formed in said spindle. The cam 19 onthe cam-shaft 20 engages tappet 8 and operates the valve 1 in the usualmanner.

In order to adjust this form of valve as sembly to obtain the properclearance, cor. pression springs 13 and 14 are compressed whereuponcollar 12 is disengaged from its seat in the tappet. After releasementof position by a tool or otherwise and tappet 8 rotated to withdraw'orcause the spindle 7 of the tappet to pass farther into the spindle 2 ofthe valve dependent upon the eXigency of the situation. The adjustmentbeing made, compression springs 13 and 14 are released to return collar12 to its initial posi' j tion in the tappet so that tappet 8 andcollarg 12 function as a unitary structure.

Interlocking the tappet and adjusting .collar in this manner manifestlyprevents any disarrangement of the parts after the clearance adjustmenthas been made.

By the preceding constructionthe efficiency of the motor is materiallyincreased since push rods and other intermediate parts tending toincrease the inertia of the valves are entirely dispensed With.Moreover, employing a valve of this kind tendsto reduce not only thecost of ments as Well. 1

Although .in the foregoing certain elements have been enumerated as bestadapted to perform the functions allotted tow th'em, nevertheless it isunderstood that various minor changes may be resorted to within thescope of theappended claims without departing from or sacrificing any ofthe principles of this invention.

Having thus described the invention what I claim as new and desire tosecure by Letters Patent is:

1. A puppet valve comprising a stem formed. of telescopically engagedsections having co-actingmeans 'for-efiecti ng their longitudinaladjustment, a valve on one sectlon, a tappet on the other section, saidtappet provided with a seat formed-With a flaring production but ofreplace-- inner surface, an adjusting collar within said seatconformingto the shape thereof, a separate removable valve stem guideprovided with a shoulder, a spring interposed between the shoulder onthe valve stem guide and the collar, and means for normally maintainingsaid tappet and valve'in locked relation. j

2. A puppet-valve assembly comprising .inner and outertelescopicallyengaged sections havingco-acting means for effecting theirlongitudlnal ad ustment, a valve on' the outer section, a tappet on theother, the

latter being formed with a seat, said seatbeing provided with a flange,said flange.

having a taperedexterior surface to produce a wedge like act-ion betweencollar and tappet and a compression spring securing the collar Withinits seat.

v HAROLD W. EVANS. Witnesses:

THOMAS H. MILLAR, Jr., JOSEPH F. CRown.

